Refractory lining for crucibles and the like



Jan. 23, 1934. H, SCHULTZ REFRACTORY LINING FOR CRUCIBLES AND THE LIKE Filed April 1, 1933 INVENTOR. flerm mm Jculiz I A TTORNEY Patented Jan. 23, 1934 n REFRACTORY LINING FOR CRUCIBLES THE LIKE

Hermann Schultz, Berlin, Germany Application April 1, 1933, Serial No. 663,875, and in Germany April 29, 1932 2 (llaims.

The invention relates to certain improvements in refractory linings for crucibles, such as are used for carrying out alumino-thermic reactions, and has for its object to provide a lining made up 5 of molded or pressed sections of plastic refractory material, the sections being so fashioned that, when arranged in superposed relation, they will form a complete lining for the crucible, but, for purposes of shipment or storage, the sections may be nested to form a substantially frusto-conical disk-like unit.

The invention is illustrated in the accompanying drawing, in which:-

Fig. 1 is a sectional elevation of the crucible having the improved lining applied thereto.

Fig. 2 is a sectional elevation of the elements of the lining in nested relation.

In the aluminoa-thermic art, it is customary to effect the reaction in crucibles provided with refractory linings which are applied in plastic condition to the interior of the crucible, compacted as much as possible, and finally baked. A typical lining material is magnesite with a binder of tar or the like, but it has been found that the life of linings of this and similar materials is generally proportional to the density of thelining structure, which is usually produced by direct pressure or by tamping operations. When the shell of the crucible is of sheet iron or steel, it is obvious that there is a practical limit to the pressing or tamping operation to produce the desired denseness of the lin ng. due to the relatively fragile character of the shell. For this reason. it has not been feasible to produce linings of maximum density in this type of crucible. Furthermore, for lining vision of a lining for crucibles of this type. which may be made of maximum density, which may be transported and applied wherever needed with a minimum expenditure of time and labor, and

which will take up a minimum of storage and transportation space.

Referring to the drawing, h indicates the sheet metal shell of the crucible, which is usually frusto-conical in shape and is provided with a tap 50 hole in the center of the bottom. The lining for the shell comprises sections a, b and 0, each comprising a ring-like member, which are frustoconical and which, when superposed in the mannerand form shown in Fig. 1, forms a complete lining for the shell h. Obviously, these ring-like sections may be formed in suitable molds under any desired degree of compression to produce the necessary density of the refractory material and thereby increase the life of the lining. When applied to the crucible shell, the several ringlike sections may be ultimately unitedby a suitable binder. v After the individual units of the lining have been fabricated, which includes curing and burning, the sets are assembled with the'unit elements in nested relation, as shown in Fig. 2. the as- Q sembly constituting a frusto-conical disk ofsub stantially uniform thickness. As indicated the element b fits within element a and the element, 80, 0 fits within element 1) and, as each of these elev ments are of uniform thickness. the nesting. of the elements will produce a frusto-conical disk having athickness'of one of the elements and which requires little space for storage and ships ment.

What I claim is:

1. A lining for crucibles, comprising refractory frusto-conical rings adapted to be superposed to form a hollow frusto-conical body and to be nested to form a frusto-conical disk.

2. A lining for crucibles, comprising refractory frusto-conical rings of equal axial height adapted to be superposed to form a hollow frusto-conical body and to be hosted to form a frusto-c'onical disk.

- HERMANN SCHULTZ. 

